Microsoft Windows FIPS 140 Validation - NIST · Microsoft Windows FIPS 140 Validation Microsoft...
Transcript of Microsoft Windows FIPS 140 Validation - NIST · Microsoft Windows FIPS 140 Validation Microsoft...
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 1 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Microsoft Windows
FIPS 140 Validation Microsoft Windows 10 (Creators Update, Fall Creators Update,
April 2018 Update)
Microsoft Windows 10 Mobile (Creators Update, Fall Creators
Update)
Microsoft Windows Server (versions 1709 and 1803)
Non-Proprietary
Security Policy Document
Document Information Version Number 1.3 Updated On October 22, 2018
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 2 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
The information contained in this document represents the current view of Microsoft Corporation on the issues discussed as of the date of publication. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information presented after the date of publication.
This document is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AS TO THE INFORMATION IN THIS DOCUMENT.
Complying with all applicable copyright laws is the responsibility of the user. This work is licensed under the Creative Commons Attribution-NoDerivs-NonCommercial License (which allows redistribution of the work). To view a copy of this license, visit http://creativecommons.org/licenses/by-nd-nc/1.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from Microsoft, the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property.
© 2018 Microsoft Corporation. All rights reserved.
Microsoft, Windows, the Windows logo, Windows Server, and BitLocker are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
The names of actual companies and products mentioned herein may be the trademarks of their respective owners.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 3 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Version History
Version Date Summary of Changes
1.0 October 3, 2017 Draft sent to NIST CMVP
1.1 November 18, 2017 Updates for Windows 10 version 1709
1.2 May 1, 2018 Editing updates
1.3 October 22, 2018 Updates for Windows 10 version 1803
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 4 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
TABLE OF CONTENTS
SECURITY POLICY DOCUMENT .....................................................................................................1
1 INTRODUCTION ...................................................................................................................6
1.1 LIST OF CRYPTOGRAPHIC MODULE BINARY EXECUTABLES ..................................................................6
1.2 VALIDATED PLATFORMS ............................................................................................................6
2 CRYPTOGRAPHIC MODULE SPECIFICATION ...........................................................................9
2.1 CRYPTOGRAPHIC BOUNDARY ......................................................................................................9
2.2 FIPS 140-2 APPROVED ALGORITHMS ..........................................................................................9
2.3 NON-APPROVED ALGORITHMS ................................................................................................. 10
2.4 FIPS 140-2 APPROVED ALGORITHMS FROM BOUNDED MODULES .................................................... 10
2.5 CRYPTOGRAPHIC BYPASS ......................................................................................................... 11
2.6 HARDWARE COMPONENTS OF THE CRYPTOGRAPHIC MODULE .......................................................... 11
3 CRYPTOGRAPHIC MODULE PORTS AND INTERFACES .......................................................... 12
3.1 CONTROL INPUT INTERFACE ..................................................................................................... 12
3.1.1 GETFVECONTEXT ............................................................................................................................. 12
3.1.2 DUMPWRITE .................................................................................................................................. 12
3.2 STATUS OUTPUT INTERFACE ..................................................................................................... 13
3.3 DATA OUTPUT INTERFACE ....................................................................................................... 13
3.4 DATA INPUT INTERFACE .......................................................................................................... 13
4 ROLES, SERVICES AND AUTHENTICATION ........................................................................... 13
4.1 ROLES ................................................................................................................................. 13
4.2 SERVICES ............................................................................................................................. 13
4.3 AUTHENTICATION .................................................................................................................. 15
5 FINITE STATE MODEL ......................................................................................................... 15
5.1 SPECIFICATION ...................................................................................................................... 15
6 OPERATIONAL ENVIRONMENT........................................................................................... 16
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 5 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
6.1 SINGLE OPERATOR ................................................................................................................. 16
6.2 CRYPTOGRAPHIC ISOLATION ..................................................................................................... 16
6.3 INTEGRITY CHAIN OF TRUST ..................................................................................................... 16
7 CRYPTOGRAPHIC KEY MANAGEMENT ................................................................................ 19
7.1 CRITICAL SECURITY PARAMETERS .............................................................................................. 19
7.2 ZEROIZATION ........................................................................................................................ 19
7.2.1 VOLATILE KEYS ................................................................................................................................ 19
7.2.2 PERSISTENT KEYS ............................................................................................................................. 19
7.3 ACCESS CONTROL POLICY ........................................................................................................ 19
8 SELF-TESTS ........................................................................................................................ 19
8.1 POWER-ON SELF-TESTS .......................................................................................................... 19
9 DESIGN ASSURANCE .......................................................................................................... 19
10 MITIGATION OF OTHER ATTACKS ....................................................................................... 20
11 SECURITY LEVELS ............................................................................................................... 20
12 ADDITIONAL DETAILS ........................................................................................................ 21
13 APPENDIX A – HOW TO VERIFY WINDOWS VERSIONS AND DIGITAL SIGNATURES ............... 22
13.1 HOW TO VERIFY WINDOWS VERSIONS ....................................................................................... 22
13.2 HOW TO VERIFY WINDOWS DIGITAL SIGNATURES ......................................................................... 22
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 6 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
1 Introduction BitLocker Drive Encryption is a data protection feature of the Windows 10 operating system which
encrypts data on a storage volume.
This security policy document describes the BitLocker Dump Filter cryptographic module which protects
hibernation files and crash dump files on BitLocker encrypted computers. Other parts of BitLocker are
described in the Security Policy Documents for Boot Manager, Windows OS Loader, and Windows OS
Resume.1
The BitLocker Dump Filter is part of the system dump stack. Whenever the dump stack is called during a
crash or starting the hibernation process, this module ensures that all data is encrypted before written
to storage as a dump file or hibernation file.
1.1 List of Cryptographic Module Binary Executables The BitLocker Dump Filter module contains the following binaries:
DUMPFVE.SYS The Windows builds covered by this validation are:
Windows 10 version 1703, build 10.0.15063
Windows 10 Mobile version 1703, build 10.0.15063
Windows 10 version 1709 and Windows Server version 1709 build 10.0.16299
Windows 10 Mobile version 1709 build 10.0.15254
Microsoft Surface Hub build 10.0.15063
Microsoft Surface Hub build 10.0.15063.674
Windows 10 version 1803 and Windows Server version 1803 build 10.0.17134
1.2 Validated Platforms The Windows editions covered by this validation are:
Microsoft Windows 10 Pro Edition (64-bit version)
Microsoft Windows 10 Enterprise Edition (64-bit version)
Microsoft Windows 10 Education Edition (64-bit version)
Microsoft Windows 10 S Edition (64-bit version)
Microsoft Windows 10 Mobile
Microsoft Surface Hub
Windows Server Standard Core
Windows Server Datacenter Core
The BitLocker Dump Filter components listed in Section 1.1 were validated using the machine
configurations and Windows Operating System versions specified in the table below.
1 Windows Resume is not a FIPS 140 cryptomodule in Windows 10 version 1803.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 7 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
All the computers for Windows 10 and Windows Server listed in the table below are all 64-bit Intel
architecture and implement the AES-NI instruction set but not the SHA Extensions. The exceptions are:
Dell Inspiron 660s - Intel Core i3 without AES-NI and SHA Extensions
HP Slimline Desktop - Intel Pentium with AES-NI and SHA Extensions
Windows 10 Mobile runs on the ARM architecture, which does not implement AES-Ni instructions or
SHA extensions:
Microsoft Lumia 950 - Qualcomm Snapdragon 808 (A57, A53)
Microsoft Lumia 950 XL - Qualcomm Snapdragon 810 (A57, A53)
Microsoft Lumia 650 - Qualcomm Snapdragon 212 (A7)
HP Elite x3 - Qualcomm Snapdragon 820 (Kryo)
Table 1 Validated Platforms for Windows 10 Creators Update, Fall Creators Update and Windows Server
Computer
Win
do
ws 1
0
Ho
me
Win
do
ws 1
0
Pro
Win
do
ws 1
0
Ente
rprise
Win
do
ws 1
0
Edu
cation
Surface
Hu
b
Win
do
ws 1
0
S Win
do
ws 1
0
Mo
bile
Win
do
ws
Serve
r Stan
dard
Win
do
ws
Serve
r D
atacen
ter
Microsoft Surface Book 2
√2
Microsoft Surface Laptop
√3 √3 √3
Microsoft Surface Pro √3 √3 √3
Microsoft Surface Book √3
Microsoft Surface Pro 4 √3
Microsoft Surface Pro 3 √3
Microsoft Surface 3 with LTE
√3
Microsoft Surface Studio √3
Windows Server 2016 Standard Edition Hyper-V4
√3
Microsoft Lumia 950 √5
Microsoft Lumia 950 XL √5
Microsoft Lumia 650 √5
Dell Latitude 5285 √3
Dell Latitude 5290 √2
Dell Inspiron 660s
2 Tested on Windows 10 version 1709 3 Tested on Windows 10 versions 1703 and 1709 4 Tested on Surface Pro 4 hardware platform 5 Tested on Windows 10 Mobile versions 1703 and 1709
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 8 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Dell Precision Tower 5810MT
√3 √2 √2
Dell PowerEdge R630 √3 √2 √2
Dell PowerEdge R740 √1 √1
HP Elite X3 √5
HP Compaq Pro 6305 √3
HP Pro x2 612 G2 Detachable PC with LTE
√3
HP Slimline Desktop √3
Panasonic Toughbook √3
Microsoft Surface 3 √6
Windows Server Standard Core Hyper-V7
√2 √2
Microsoft Surface Hub √8
Table 2 Validated Platforms for Windows 10 and Windows Server version 1803
Computer Windows 10 Home
Windows 10 Pro
Windows 10 Enterprise
Windows 10 Education
Windows Server Standard
Windows Server Datacenter
Microsoft Surface Go
√
Microsoft Surface Book 2
√ √
Microsoft Surface Pro LTE
√ √
Microsoft Surface Laptop
√ √ √
Microsoft Surface Studio
√
Windows Server Standard Core Hyper-V9
√ √
Windows Server 2016 Hyper-V10
√
Dell Latitude 5290
√
6 Tested on Windows 10 version 1703 7 Tested on Dell 5810MT hardware platform 8 Tested on Surface Hub 10.0.15063 and 10.0.15063.674 9 Hardware platform: Dell Precision Tower 5810MT 10 Hardware platform: Dell PowerEdge R740
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 9 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Computer Windows 10 Home
Windows 10 Pro
Windows 10 Enterprise
Windows 10 Education
Windows Server Standard
Windows Server Datacenter
Dell Latitude 12 Rugged Tablet
√
Dell Inspiron 660s
Dell PowerEdge R740
√ √
HP Pro x2 612 G2 Detachable PC with LTE
√
HP Slimline Desktop
√
2 Cryptographic Module Specification BitLocker Dump Filter is a multi-chip standalone module that operates in FIPS-approved mode during
normal operation of the computer and Windows operating system.
The following configurations and modes of operation will cause BitLocker Dump Filter to operate in a
non-approved mode of operation:
Boot Windows in Debug mode
Boot Windows with Driver Signing disabled
Windows enters the ACPI S4 power state (for Windows 10 version 1803 only)
2.1 Cryptographic Boundary The software binary that comprises the cryptographic boundary for BitLocker Dump Filter is
DUMPFVE.SYS.
2.2 FIPS 140-2 Approved Algorithms BitLocker Dump Filter implements the following FIPS 140-2 Approved algorithms:11
Algorithm Windows 10 version 1703
Windows 10 version 1709 and Windows Server
Windows 10 Mobile version 1709
Microsoft Surface Hub (15063.674)
Windows 10 version 1803
FIPS 197 AES CBC 128 and 256
#4624 #4897 #4901 #4902 #5847
11 This module may not use some of the capabilities described in each CAVP certificate.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 10 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
NIST SP 800-38E AES XTS 128 and 256
#4624 #4897 #4901 #4902 # 5847
NIST SP 800-38C AES CCM 256
#4625 #4894 #4895 #4896 # 5859
2.3 Non-Approved Algorithms BitLocker Dump Filter implements the following non-approved algorithm:
IEEE 1619-2007 AES-XTS 128 and 256
2.4 FIPS 140-2 Approved Algorithms from Bounded Modules A bounded module is a FIPS 140 module which provides cryptographic functionality that is relied on by a
downstream module. As described in the Integrity Chain of Trust section, the BitLocker Dump Filter
depends on the following modules and algorithms:
When Hypervisor Code Integrity (HVCI) is not enabled for Windows 10 version 1703, Code Integrity
(module certificate #3093) provides:
CAVP certificate #2522 for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048
moduli; supporting SHA-256
CAVP certificate #3790 for FIPS 180-4 SHS SHA-256
When HVCI is not enabled for Windows 10 version 1709, Code Integrity (module certificate #3195)
provides:
CAVP certificates #2668 (Windows 10 and Windows Server), #2669 (Windows 10 Mobile), #2672
(Surface Hub) for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048 moduli;
supporting SHA-256
CAVP certificates #4009 (Windows 10 and Windows Server), #4010 (Windows 10 Mobile), #4011
(Surface Hub) for FIPS 180-4 SHS SHA-256
When Memory Integrity, also known as HVCI in earlier Windows 10 reelases, is not enabled for Windows
10 version 1803, Code Integrity (module certificate #3195) provides:
CAVP certificates # 3080 for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048
moduli; supporting SHA-256
CAVP certificates # 4633 for FIPS 180-4 SHS SHA-256
When HVCI is enabled for Windows 10 version 1703, Secure Kernel Code Integrity (module certificate
#3096) provides:
CAVP certificate #2522 for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048
moduli; supporting SHA-256
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 11 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
CAVP certificate #3790 for FIPS 180-4 SHS SHA-256
When HVCI is enabled for Windows 10 version 1709, Secure Kernel Code Integrity (module certificate
#3096) provides:
CAVP certificate #2668 (Windows 10 and Windows Server) for FIPS 186-4 RSA PKCS#1 (v1.5)
digital signature verification with 2048 moduli; supporting SHA-256
CAVP certificate #4009 (Windows 10 and Windows Server) for FIPS 180-4 SHS SHA-256
When Memory Integrity is enabled for Windows 10 version 1803, Secure Kernel Code Integrity (module
certificate # 3096) provides:
CAVP certificate # 3080 for FIPS 186-4 RSA PKCS#1 (v1.5) digital signature verification with 2048
moduli; supporting SHA-256
CAVP certificate # 4633 for FIPS 180-4 SHS SHA-256
Note that the validated platforms listed in section 1.2 include processors that support the SHA
Extensions. This module does not implement SHA, but the bounded modules may implement SHA and,
therefore, use the SHA Extensions.
2.5 Cryptographic Bypass Cryptographic bypass is not supported by BitLocker Dump Filter.
2.6 Hardware Components of the Cryptographic Module The physical boundary of the module is the physical boundary of the computer that contains the
module. The following diagram illustrates the hardware components used by the BitLocker Dump Filter
module:
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 12 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
3 Cryptographic Module Ports and Interfaces
3.1 Control Input Interface The BitLocker Dump Filter module’s control input interface consists of parameter interfaces for the
GetFveContext and DumpWrite functions. These interfaces are not exported, but rather, are internal to
the cryptographic module.
3.1.1 GetFveContext
NTSTATUS GetFveContext( __in PFILTER_EXTENSION Context, __in ULONG MaxPagesPerWrite, __inout_xcount(FveContext->StructureSize) PFVE_CONTEXT FveContext )
This function gets the BitLocker Full Volume Encryption Key for the storage volume. The Context
parameter supplies the dump stack filter context. The FveContext parameter supplies the internal
BitLocker context, which includes the BitLocker status and FVEK in this context so it can be used later
when writing data to the volume.
3.1.2 DumpWrite
NTSTATUS DumpWrite( PFILTER_EXTENSION Context, PLARGE_INTEGER DiskByteOffset,
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 13 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
PMDL Mdl )
This function uses the FVEK from the Context parameter that is provided by the GetFveContext
interface. The DiskByteOffset parameter is used to specify the location on the volume to receive the
encrypted output data. The Mdl parameter points to the input data to be encrypted.
3.2 Status Output Interface The BitLocker Dump Filter status output is a return value of type NTSTATUS that indicates whether the
function completed successfully or not.
The BitLocker Dump Filter has no status output interface for self-test errors. If the self-tests pass, the
module is loaded. If not, the dump filter securely zeroes out memory for any keys handed to it and
unloads itself.
3.3 Data Output Interface The Data Output Interface is the data returned from the DumpWrite function.
This function is responsible for providing the encrypted content for the crash dump file or hibernate file.
Data exits the module in the form of encrypted blocks that may be written to a crash dump file or a
hibernation file on an encrypted volume.
3.4 Data Input Interface The Data Input Interface includes the GetFveContext function and DumpWrite function. GetFveContext
is responsible for reading the FVEK. DumpWrite accepts the memory blocks to encrypt with the FVEK
and the target disk locations for the blocks as input.
4 Roles, Services and Authentication
4.1 Roles BitLocker Dump Filter is a kernel-mode driver that does not interact with the user through any service
therefore the module’s functions are fully automatic and not configurable. FIPS 140 validations define
formal “User” and “Cryptographic Officer” roles. Both roles can use any BitLocker Dump Filter service.
4.2 Services BitLocker Dump Filter services are described below. This module does not export any cryptographic
functions.
1. Writing encrypted crash dump data – This service is executed when the system crashes and
must write the crash dump file to an encrypted volume.
2. Writing encrypted hibernation file data - This service is executed when the system enters the
hibernation (S4) power state and must write the hibernation file to an encrypted volume.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 14 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
3. Show Status – The module provides a show status service that is automatically executed by the
module to provide the status response of the module either via output to the computer monitor
or to log files.
4. Self-Tests - The module provides a power-up self-tests service that is automatically executed
when the module is loaded into memory.
5. Zeroizing Cryptographic Material - This service is executed as part of the module shutdown. See
Cryptographic Key Management
The following table maps the services to their corresponding algorithms and critical security parameters
(CSPs) as described in Cryptographic Key Management.
Service Algorithms CSPs Invocation
Writing encrypted crash dump data
FIPS 197 AES: AES CBC 128 and 256 bits AES XTS 128 and 256 bits12 AES CCM 256 IEEE 1619-2007 XTS-AES (non-FIPS Approved algorithm)
Full Volume Encryption Key (FVEK)
This service is fully automatic.
Writing encrypted hibernation data
FIPS 197 AES: AES CBC 128 and 256 bits AES XTS 128 and 256 bits13 AES CCM 256 IEEE 1619-2007 XTS-AES (non-FIPS Approved algorithm)
Full Volume Encryption Key (FVEK)
This service is fully automatic.
Show Status None None This service is fully automatic. This service is executed upon completion of the Control Input Interfaces.
Self-Tests AES-CBC - Encrypt/Decrypt KATs AES-CCM - Encrypt/Decrypt KATs Software Integrity Test (2048-bit RSA with SHA-256) AES XTS KAT
None This service is fully automatic.
12 The length of the data unit does not exceed 220 AES blocks for storage applications such as BitLocker. 13 The length of the data unit does not exceed 220 AES blocks for storage applications such as BitLocker.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 15 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Zeroizing Cryptographic Material (see Section 9)
None Full Volume Encryption Key (FVEK)
This service is fully automatic.
4.3 Authentication The module does not provide authentication. Roles are implicitly assumed based on the services that are
executed.
5 Finite State Model
5.1 Specification The following diagram shows the finite state model for BitLocker Dump Filter:
Integrity Check OK?
Yes
Self Test Pass?
Driver Load FailureNo
No
Yes
Wait for Crash Dump or
Hibernate
Encrypt Hibernate or Crash Dump file and
write to storage
Ntoskrnl.exe loads DUMPFVE.SYS
HVCI Enabled?
SKCI validates DUMPFVE.SYS
No
CI validates DUMPFVE.SYS
Yes
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 16 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
6 Operational Environment The operational environment for BitLocker Dump Filter is the Windows 10 operating system running on
a supported hardware platform.
6.1 Single Operator The BitLocker Dump Filter is loaded into kernel memory as part of the boot process before the logon
component is initialized, and so there necessarily is a single operator for the module.
6.2 Cryptographic Isolation In the Windows operating system, all kernel-mode modules, including DUMPFVE.SYS, are loaded into
the Windows Kernel (ntoskrnl.exe) which executes as a single process. The Windows operating system
environment enforces process isolation from user-mode processes including memory and CPU
scheduling between the kernel and user-mode processes.
6.3 Integrity Chain of Trust Windows uses several mechanisms to provide integrity verification depending on the stage in the OS
boot sequence and also on the hardware and OS configuration. The following diagram describes the
Integrity Chain of trust for each supported configuration for the following versions:
Windows 10 version 1703, build 10.0.15063
Windows 10 Mobile version 1709 build 10.0.15254
Windows 10 Mobile version 1703, build 10.0.15063
Microsoft Surface Hub build 10.0.15063
Microsoft Surface Hub build 15063.674
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 17 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
The following diagram describes the Integrity Chain of trust for each supported configuration for the
following versions:
Windows 10 and Windows Server version 1709 and 1803
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 18 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
BCryptPrimitives.dllBitLocker Dump
Filter (DumpFVE.sys)
Virtual TPM (TPMEng.dll)
Code Integrity (CI.dll)
Secure Kernel Code Integrity (SKCI.dll)
CNG.sys
Windows Resume (WinResume.efi)Windows OS Loader (WinLoad.efi)
Boot Manager (BootMgr.efi)
UEFI
When Secure Boot is enabled, UEFI validates
Not enabled
Enabled
Memory Integrity
Core Isolation not enabledCore Isolation enabled
The integrity of the BitLocker Dump Filter module is checked according to the following:
If Memory Integrity, also known as Hypervisor Code Integrity (HVCI), is not enabled, then the
Code Integrity module performs the integrity check.
If Memory Integrity is enabled then the Secure Kernel Code Integrity module performs the
integrity check.
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 19 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Windows binaries include a SHA-256 hash of the binary signed with the 2048 bit Microsoft RSA code-
signing key (the key associated with the Microsoft code-signing certificate). The integrity check uses the
public key component of the Microsoft code signing certificate to verify the signed hash of the binary.
7 Cryptographic Key Management
7.1 Critical Security Parameters When the System Volume is encrypted with Bitlocker, BitLocker Dump Filter uses this critical security
parameter (CSP):
Full Volume Encryption Key (FVEK) - 128 or 256-bit AES key that is used to encrypt dump and hibernation files.
The FVEK is passed to BitLocker Dump Filter by the Windows Kernel which received the FVEK from either the Windows OS Loader or Windows Resume modules.
7.2 Zeroization
7.2.1 Volatile Keys
The FVEK is zeroized when the module is unloaded as part of shutting down or hibernating Windows.
7.2.2 Persistent Keys
BitLocker Dump Filter does not have any persistent keys.
7.3 Access Control Policy The BitLocker Dump Filter does not allow access to the cryptographic keys contained within it, so an
access control table is not included in this document. BitLocker Dump Filter receives keys from outside
the module and then manages them appropriately once received. BitLocker Dump Filter prevents access
to its keys by zeroizing them after use.
8 Self-Tests
8.1 Power-On Self-Tests The BitLocker Dump Filter implements Known Answer Test (KAT) functions each time the module is
loaded. The module performs the following KATs:
AES-CBC Encrypt/Decrypt Known Answer Tests
AES-CCM Encrypt/Decrypt Known Answer Tests
XTS-AES Encrypt/Decrypt Known Answer Tests
If the self-test fails, the module will not load and a status code STATUS_FAIL_CHECK will be returned.
9 Design Assurance
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 20 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
The secure installation, generation, and startup procedures of this cryptographic module are part of the
overall operating system secure installation, configuration, and startup procedures for the Windows 10
operating system.
The Windows 10 operating system must be pre-installed on a computer by an OEM, installed by the
end-user, by an organization’s IT administrator, or updated from a previous Windows 10 version
downloaded from Windows Update.
An inspection of authenticity of the physical medium can be made by following the guidance at this
Microsoft web site: https://www.microsoft.com/en-us/howtotell/default.aspx
The installed version of Windows 10 must be checked to match the version that was validated. See
Appendix A for details on how to do this.
For Windows Updates, the client only accepts binaries signed with Microsoft certificates. The Windows
Update client only accepts content whose signed SHA-2 hash matches the SHA-2 hash specified in the
metadata. All metadata communication is done over a Secure Sockets Layer (SSL) port. Using SSL
ensures that the client is communicating with the real server and so prevents a spoof server from
sending the client harmful requests. The version and digital signature of new cryptographic module
releases must be verified to match the version that was validated. See Appendix A for details on how to
do this.
10 Mitigation of Other Attacks The following table lists the mitigations of other attacks for this cryptographic module:
Algorithm Protected Against
Mitigation
AES
Timing Analysis Attack
Constant time implementation
Cache Attack Memory Access pattern is independent of any confidential data
Protected Against Cache attacks only when used with AES NI
11 Security Levels The security level for each FIPS 140-2 security requirement is given in the following table.
Security Requirement Security Level
Cryptographic Module Specification 1
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 21 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
Cryptographic Module Ports and Interfaces 1
Roles, Services, and Authentication 1
Finite State Model 1
Physical Security NA
Operational Environment 1
Cryptographic Key Management 1
EMI/EMC 1
Self-Tests 1
Design Assurance 2
Mitigation of Other Attacks 1
12 Additional Details For the latest information on Microsoft Windows, check out the Microsoft web site at:
https://www.microsoft.com/en-us/windows
For more information about FIPS 140 validations of Microsoft products, please see:
https://docs.microsoft.com/en-us/windows/security/threat-protection/fips-140-validation
BitLocker Dump Filter Security Policy Document
© 2018 Microsoft. All Rights Reserved Page 22 of 22 This Security Policy is non-proprietary and may be reproduced only in its original entirety (without revision).
13 Appendix A – How to Verify Windows Versions and Digital Signatures
13.1 How to Verify Windows Versions The installed version of Windows 10 OEs must be verified to match the version that was validated using
the following method:
1. In the Search box type "cmd" and open the Command Prompt desktop app. 2. The command window will open. 3. At the prompt, enter "ver”. 4. The version information will be displayed in a format like this:
Microsoft Windows [Version 10.0.xxxxx]
If the version number reported by the utility matches the expected output, then the installed version has been validated to be correct.
13.2 How to Verify Windows Digital Signatures After performing a Windows Update that includes changes to a cryptographic module, the digital
signature and file version of the binary executable file must be verified. This is done like so:
1. Open a new window in Windows Explorer. 2. Type “C:\Windows\” in the file path field at the top of the window. 3. Type the cryptographic module binary executable file name (for example, “CNG.SYS”) in the
search field at the top right of the window, then press the Enter key. 4. The file will appear in the window. 5. Right click on the file’s icon. 6. Select Properties from the menu and the Properties window opens. 7. Select the Details tab. 8. Note the File version Property and its value, which has a number in this format: xx.x.xxxxx.xxxx. 9. If the file version number matches one of the version numbers that appear at the start of this
security policy document, then the version number has been verified. 10. Select the Digital Signatures tab. 11. In the Signature list, select the Microsoft Windows signer. 12. Click the Details button. 13. Under the Digital Signature Information, you should see: “This digital signature is OK.” If that
condition is true, then the digital signature has been verified.